35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From bd47276f21ee17dd70d67fb7f69499ce108a05bf Mon Sep 17 00:00:00 2001
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
Date: Tue, 28 Feb 2012 19:10:46 +0100
|
|
Subject: [PATCH 017/287] x86: vdso: Remove bogus locking in
|
|
update_vsyscall_tz()
|
|
|
|
Changing the sequence count in update_vsyscall_tz() is completely
|
|
pointless.
|
|
|
|
The vdso code copies the data unprotected. There is no point to change
|
|
this as sys_tz is nowhere protected at all. See sys_gettimeofday().
|
|
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
---
|
|
arch/x86/kernel/vsyscall_64.c | 5 -----
|
|
1 file changed, 5 deletions(-)
|
|
|
|
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
|
|
index e4d4a22..f04adbd 100644
|
|
--- a/arch/x86/kernel/vsyscall_64.c
|
|
+++ b/arch/x86/kernel/vsyscall_64.c
|
|
@@ -80,12 +80,7 @@ early_param("vsyscall", vsyscall_setup);
|
|
|
|
void update_vsyscall_tz(void)
|
|
{
|
|
- unsigned long flags;
|
|
-
|
|
- write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
|
|
- /* sys_tz has changed */
|
|
vsyscall_gtod_data.sys_tz = sys_tz;
|
|
- write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
|
|
}
|
|
|
|
void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
|